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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cb050ed0a9f3dae1e77e6d4d77dd0ce7d38bfaa9068f88e551bd533c354e68' 
  AND token = 'Vdv5eh4i5cqWe7xL5GvyNj1ie1uyt5lNTnU7IBcHcwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}